If accurate, marijuana tourism would present additional opportunities for entrepreneurs looking to capitalize on the legalization of marijuana.

“The prospects seem strong that marijuana is now about to be added to beer and wine as a permissible product to order,” Frommer wrote in a column last week, the Denver Post reported. “This seems about to happen. Get ready for the era of marijuana — and marijuana tourism.”

Cannabis tourism isn’t new in Colorado and Washington State, which have been selling legally to tourists for over two years now. But with the addition of Alaska and Oregon, which legalized in 2014, and possibly Arizona, California, Maine, Massachusetts and Nevada – which will all vote on rec in November – the tourism market could explode, Frommer wrote.

“We are on the brink of a major new travel movement,” predicted Frommer, a publisher of books for budget-conscious travelers.